How State Income Tax Works, 2026
Unlike the federal system, state income tax isn't one set of rules — it's 41 different systems, each with its own rates, brackets, deductions, and residency rules. Nine states charge nothing at all, 15 use a single flat rate, and the rest use graduated brackets similar to (but never identical to) the federal structure. Add remote work, multi-state commuting, reciprocity agreements, and the "convenience of the employer" rule, and most people have no idea which state actually taxes their income — or how much. This guide explains the entire system from the ground up for 2026.